[rustc.git] / src / tools / clippy / src / driver.rs

#![feature(rustc_private)]
#![feature(once_cell)]
#![cfg_attr(feature = "deny-warnings", deny(warnings))]
// warn on lints, that are included in `rust-lang/rust`s bootstrap
#![warn(rust_2018_idioms, unused_lifetimes)]
// warn on rustc internal lints
#![warn(rustc::internal)]

// FIXME: switch to something more ergonomic here, once available.
// (Currently there is no way to opt into sysroot crates without `extern crate`.)
extern crate rustc_driver;
extern crate rustc_errors;
extern crate rustc_interface;
extern crate rustc_session;
extern crate rustc_span;

use rustc_interface::interface;
use rustc_session::parse::ParseSess;
use rustc_span::symbol::Symbol;
use rustc_tools_util::VersionInfo;

use std::borrow::Cow;
use std::env;
use std::lazy::SyncLazy;
use std::ops::Deref;
use std::panic;
use std::path::{Path, PathBuf};
use std::process::{exit, Command};

/// If a command-line option matches `find_arg`, then apply the predicate `pred` on its value. If
/// true, then return it. The parameter is assumed to be either `--arg=value` or `--arg value`.
fn arg_value<'a, T: Deref<Target = str>>(
    args: &'a [T],
    find_arg: &str,
    pred: impl Fn(&str) -> bool,
) -> Option<&'a str> {
    let mut args = args.iter().map(Deref::deref);
    while let Some(arg) = args.next() {
        let mut arg = arg.splitn(2, '=');
        if arg.next() != Some(find_arg) {
            continue;
        }

        match arg.next().or_else(|| args.next()) {
            Some(v) if pred(v) => return Some(v),
            _ => {},
        }
    }
    None
}

#[test]
fn test_arg_value() {
    let args = &["--bar=bar", "--foobar", "123", "--foo"];

    assert_eq!(arg_value(&[] as &[&str], "--foobar", |_| true), None);
    assert_eq!(arg_value(args, "--bar", |_| false), None);
    assert_eq!(arg_value(args, "--bar", |_| true), Some("bar"));
    assert_eq!(arg_value(args, "--bar", |p| p == "bar"), Some("bar"));
    assert_eq!(arg_value(args, "--bar", |p| p == "foo"), None);
    assert_eq!(arg_value(args, "--foobar", |p| p == "foo"), None);
    assert_eq!(arg_value(args, "--foobar", |p| p == "123"), Some("123"));
    assert_eq!(arg_value(args, "--foo", |_| true), None);
}

fn track_clippy_args(parse_sess: &mut ParseSess, args_env_var: &Option<String>) {
    parse_sess.env_depinfo.get_mut().insert((
        Symbol::intern("CLIPPY_ARGS"),
        args_env_var.as_deref().map(Symbol::intern),
    ));
}

struct DefaultCallbacks;
impl rustc_driver::Callbacks for DefaultCallbacks {}

/// This is different from `DefaultCallbacks` that it will inform Cargo to track the value of
/// `CLIPPY_ARGS` environment variable.
struct RustcCallbacks {
    clippy_args_var: Option<String>,
}

impl rustc_driver::Callbacks for RustcCallbacks {
    fn config(&mut self, config: &mut interface::Config) {
        let clippy_args_var = self.clippy_args_var.take();
        config.parse_sess_created = Some(Box::new(move |parse_sess| {
            track_clippy_args(parse_sess, &clippy_args_var);
        }));
    }
}

struct ClippyCallbacks {
    clippy_args_var: Option<String>,
}

impl rustc_driver::Callbacks for ClippyCallbacks {
    fn config(&mut self, config: &mut interface::Config) {
        let previous = config.register_lints.take();
        let clippy_args_var = self.clippy_args_var.take();
        config.parse_sess_created = Some(Box::new(move |parse_sess| {
            track_clippy_args(parse_sess, &clippy_args_var);
        }));
        config.register_lints = Some(Box::new(move |sess, lint_store| {
            // technically we're ~guaranteed that this is none but might as well call anything that
            // is there already. Certainly it can't hurt.
            if let Some(previous) = &previous {
                (previous)(sess, lint_store);
            }

            let conf = clippy_lints::read_conf(sess);
            clippy_lints::register_plugins(lint_store, sess, &conf);
            clippy_lints::register_pre_expansion_lints(lint_store, sess, &conf);
            clippy_lints::register_renamed(lint_store);
        }));

        // FIXME: #4825; This is required, because Clippy lints that are based on MIR have to be
        // run on the unoptimized MIR. On the other hand this results in some false negatives. If
        // MIR passes can be enabled / disabled separately, we should figure out, what passes to
        // use for Clippy.
        config.opts.debugging_opts.mir_opt_level = Some(0);
    }
}

fn display_help() {
    println!(
        "\
Checks a package to catch common mistakes and improve your Rust code.

Usage:
    cargo clippy [options] [--] [<opts>...]

Common options:
    -h, --help               Print this message
        --rustc              Pass all args to rustc
    -V, --version            Print version info and exit

Other options are the same as `cargo check`.

To allow or deny a lint from the command line you can use `cargo clippy --`
with:

    -W --warn OPT       Set lint warnings
    -A --allow OPT      Set lint allowed
    -D --deny OPT       Set lint denied
    -F --forbid OPT     Set lint forbidden

You can use tool lints to allow or deny lints from your code, eg.:

    #[allow(clippy::needless_lifetimes)]
"
    );
}

const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust-clippy/issues/new";

static ICE_HOOK: SyncLazy<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send + 'static>> = SyncLazy::new(|| {
    let hook = panic::take_hook();
    panic::set_hook(Box::new(|info| report_clippy_ice(info, BUG_REPORT_URL)));
    hook
});

fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
    // Invoke our ICE handler, which prints the actual panic message and optionally a backtrace
    (*ICE_HOOK)(info);

    // Separate the output with an empty line
    eprintln!();

    let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
        rustc_errors::ColorConfig::Auto,
        None,
        false,
        false,
        None,
        false,
    ));
    let handler = rustc_errors::Handler::with_emitter(true, None, emitter);

    // a .span_bug or .bug call has already printed what
    // it wants to print.
    if !info.payload().is::<rustc_errors::ExplicitBug>() {
        let mut d = rustc_errors::Diagnostic::new(rustc_errors::Level::Bug, "unexpected panic");
        handler.emit_diagnostic(&mut d);
    }

    let version_info = rustc_tools_util::get_version_info!();

    let xs: Vec<Cow<'static, str>> = vec![
        "the compiler unexpectedly panicked. this is a bug.".into(),
        format!("we would appreciate a bug report: {}", bug_report_url).into(),
        format!("Clippy version: {}", version_info).into(),
    ];

    for note in &xs {
        handler.note_without_error(note);
    }

    // If backtraces are enabled, also print the query stack
    let backtrace = env::var_os("RUST_BACKTRACE").map_or(false, |x| &x != "0");

    let num_frames = if backtrace { None } else { Some(2) };

    interface::try_print_query_stack(&handler, num_frames);
}

fn toolchain_path(home: Option<String>, toolchain: Option<String>) -> Option<PathBuf> {
    home.and_then(|home| {
        toolchain.map(|toolchain| {
            let mut path = PathBuf::from(home);
            path.push("toolchains");
            path.push(toolchain);
            path
        })
    })
}

#[allow(clippy::too_many_lines)]
pub fn main() {
    rustc_driver::init_rustc_env_logger();
    SyncLazy::force(&ICE_HOOK);
    exit(rustc_driver::catch_with_exit_code(move || {
        let mut orig_args: Vec<String> = env::args().collect();

        // Get the sysroot, looking from most specific to this invocation to the least:
        // - command line
        // - runtime environment
        //    - SYSROOT
        //    - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN
        // - sysroot from rustc in the path
        // - compile-time environment
        //    - SYSROOT
        //    - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN
        let sys_root_arg = arg_value(&orig_args, "--sysroot", |_| true);
        let have_sys_root_arg = sys_root_arg.is_some();
        let sys_root = sys_root_arg
            .map(PathBuf::from)
            .or_else(|| std::env::var("SYSROOT").ok().map(PathBuf::from))
            .or_else(|| {
                let home = std::env::var("RUSTUP_HOME")
                    .or_else(|_| std::env::var("MULTIRUST_HOME"))
                    .ok();
                let toolchain = std::env::var("RUSTUP_TOOLCHAIN")
                    .or_else(|_| std::env::var("MULTIRUST_TOOLCHAIN"))
                    .ok();
                toolchain_path(home, toolchain)
            })
            .or_else(|| {
                Command::new("rustc")
                    .arg("--print")
                    .arg("sysroot")
                    .output()
                    .ok()
                    .and_then(|out| String::from_utf8(out.stdout).ok())
                    .map(|s| PathBuf::from(s.trim()))
            })
            .or_else(|| option_env!("SYSROOT").map(PathBuf::from))
            .or_else(|| {
                let home = option_env!("RUSTUP_HOME")
                    .or(option_env!("MULTIRUST_HOME"))
                    .map(ToString::to_string);
                let toolchain = option_env!("RUSTUP_TOOLCHAIN")
                    .or(option_env!("MULTIRUST_TOOLCHAIN"))
                    .map(ToString::to_string);
                toolchain_path(home, toolchain)
            })
            .map(|pb| pb.to_string_lossy().to_string())
            .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");

        // make "clippy-driver --rustc" work like a subcommand that passes further args to "rustc"
        // for example `clippy-driver --rustc --version` will print the rustc version that clippy-driver
        // uses
        if let Some(pos) = orig_args.iter().position(|arg| arg == "--rustc") {
            orig_args.remove(pos);
            orig_args[0] = "rustc".to_string();

            // if we call "rustc", we need to pass --sysroot here as well
            let mut args: Vec<String> = orig_args.clone();
            if !have_sys_root_arg {
                args.extend(vec!["--sysroot".into(), sys_root]);
            };

            return rustc_driver::RunCompiler::new(&args, &mut DefaultCallbacks).run();
        }

        if orig_args.iter().any(|a| a == "--version" || a == "-V") {
            let version_info = rustc_tools_util::get_version_info!();
            println!("{}", version_info);
            exit(0);
        }

        // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
        // We're invoking the compiler programmatically, so we ignore this/
        let wrapper_mode = orig_args.get(1).map(Path::new).and_then(Path::file_stem) == Some("rustc".as_ref());

        if wrapper_mode {
            // we still want to be able to invoke it normally though
            orig_args.remove(1);
        }

        if !wrapper_mode && (orig_args.iter().any(|a| a == "--help" || a == "-h") || orig_args.len() == 1) {
            display_help();
            exit(0);
        }

        // this conditional check for the --sysroot flag is there so users can call
        // `clippy_driver` directly
        // without having to pass --sysroot or anything
        let mut args: Vec<String> = orig_args.clone();
        if !have_sys_root_arg {
            args.extend(vec!["--sysroot".into(), sys_root]);
        };

        let mut no_deps = false;
        let clippy_args_var = env::var("CLIPPY_ARGS").ok();
        let clippy_args = clippy_args_var
            .as_deref()
            .unwrap_or_default()
            .split("__CLIPPY_HACKERY__")
            .filter_map(|s| match s {
                "" => None,
                "--no-deps" => {
                    no_deps = true;
                    None
                },
                _ => Some(s.to_string()),
            })
            .chain(vec!["--cfg".into(), r#"feature="cargo-clippy""#.into()])
            .collect::<Vec<String>>();

        // We enable Clippy if one of the following conditions is met
        // - IF Clippy is run on its test suite OR
        // - IF Clippy is run on the main crate, not on deps (`!cap_lints_allow`) THEN
        //    - IF `--no-deps` is not set (`!no_deps`) OR
        //    - IF `--no-deps` is set and Clippy is run on the specified primary package
        let cap_lints_allow = arg_value(&orig_args, "--cap-lints", |val| val == "allow").is_some();
        let in_primary_package = env::var("CARGO_PRIMARY_PACKAGE").is_ok();

        let clippy_enabled = !cap_lints_allow && (!no_deps || in_primary_package);
        if clippy_enabled {
            args.extend(clippy_args);
        }

        if clippy_enabled {
            rustc_driver::RunCompiler::new(&args, &mut ClippyCallbacks { clippy_args_var }).run()
        } else {
            rustc_driver::RunCompiler::new(&args, &mut RustcCallbacks { clippy_args_var }).run()
        }
    }))
}
Commit	Line	Data
f20569fa XL	1	#![feature(rustc_private)]
	2	#![feature(once_cell)]
	3	#![cfg_attr(feature = "deny-warnings", deny(warnings))]
	4	// warn on lints, that are included in `rust-lang/rust`s bootstrap
	5	#![warn(rust_2018_idioms, unused_lifetimes)]
	6	// warn on rustc internal lints
cdc7bbd5	7	#![warn(rustc::internal)]
f20569fa XL	8
	9	// FIXME: switch to something more ergonomic here, once available.
	10	// (Currently there is no way to opt into sysroot crates without `extern crate`.)
	11	extern crate rustc_driver;
	12	extern crate rustc_errors;
	13	extern crate rustc_interface;
	14	extern crate rustc_session;
	15	extern crate rustc_span;
	16
	17	use rustc_interface::interface;
	18	use rustc_session::parse::ParseSess;
	19	use rustc_span::symbol::Symbol;
	20	use rustc_tools_util::VersionInfo;
	21
	22	use std::borrow::Cow;
	23	use std::env;
	24	use std::lazy::SyncLazy;
	25	use std::ops::Deref;
	26	use std::panic;
	27	use std::path::{Path, PathBuf};
	28	use std::process::{exit, Command};
	29
	30	/// If a command-line option matches `find_arg`, then apply the predicate `pred` on its value. If
	31	/// true, then return it. The parameter is assumed to be either `--arg=value` or `--arg value`.
	32	fn arg_value<'a, T: Deref<Target = str>>(
	33	args: &'a [T],
	34	find_arg: &str,
	35	pred: impl Fn(&str) -> bool,
	36	) -> Option<&'a str> {
	37	let mut args = args.iter().map(Deref::deref);
	38	while let Some(arg) = args.next() {
	39	let mut arg = arg.splitn(2, '=');
	40	if arg.next() != Some(find_arg) {
	41	continue;
	42	}
	43
	44	match arg.next().or_else(\|\| args.next()) {
	45	Some(v) if pred(v) => return Some(v),
	46	_ => {},
	47	}
	48	}
	49	None
	50	}
	51
	52	#[test]
	53	fn test_arg_value() {
	54	let args = &["--bar=bar", "--foobar", "123", "--foo"];
	55
	56	assert_eq!(arg_value(&[] as &[&str], "--foobar", \|_\| true), None);
	57	assert_eq!(arg_value(args, "--bar", \|_\| false), None);
	58	assert_eq!(arg_value(args, "--bar", \|_\| true), Some("bar"));
	59	assert_eq!(arg_value(args, "--bar", \|p\| p == "bar"), Some("bar"));
	60	assert_eq!(arg_value(args, "--bar", \|p\| p == "foo"), None);
	61	assert_eq!(arg_value(args, "--foobar", \|p\| p == "foo"), None);
	62	assert_eq!(arg_value(args, "--foobar", \|p\| p == "123"), Some("123"));
	63	assert_eq!(arg_value(args, "--foo", \|_\| true), None);
	64	}
	65
	66	fn track_clippy_args(parse_sess: &mut ParseSess, args_env_var: &Option<String>) {
	67	parse_sess.env_depinfo.get_mut().insert((
	68	Symbol::intern("CLIPPY_ARGS"),
	69	args_env_var.as_deref().map(Symbol::intern),
	70	));
	71	}
72
73	struct DefaultCallbacks;
74	impl rustc_driver::Callbacks for DefaultCallbacks {}
75
76	/// This is different from `DefaultCallbacks` that it will inform Cargo to track the value of
77	/// `CLIPPY_ARGS` environment variable.
78	struct RustcCallbacks {
79	clippy_args_var: Option<String>,
80	}
81
82	impl rustc_driver::Callbacks for RustcCallbacks {
83	fn config(&mut self, config: &mut interface::Config) {
84	let clippy_args_var = self.clippy_args_var.take();
85	config.parse_sess_created = Some(Box::new(move \|parse_sess\| {
86	track_clippy_args(parse_sess, &clippy_args_var);
87	}));
88	}
89	}
90
91	struct ClippyCallbacks {
92	clippy_args_var: Option<String>,
93	}
94
95	impl rustc_driver::Callbacks for ClippyCallbacks {
96	fn config(&mut self, config: &mut interface::Config) {
97	let previous = config.register_lints.take();
98	let clippy_args_var = self.clippy_args_var.take();
99	config.parse_sess_created = Some(Box::new(move \|parse_sess\| {
100	track_clippy_args(parse_sess, &clippy_args_var);
101	}));
cdc7bbd5	102	config.register_lints = Some(Box::new(move \|sess, lint_store\| {
f20569fa XL	103	// technically we're ~guaranteed that this is none but might as well call anything that
	104	// is there already. Certainly it can't hurt.
	105	if let Some(previous) = &previous {
	106	(previous)(sess, lint_store);
	107	}
	108
17df50a5	109	let conf = clippy_lints::read_conf(sess);
cdc7bbd5	110	clippy_lints::register_plugins(lint_store, sess, &conf);
a2a8927a	111	clippy_lints::register_pre_expansion_lints(lint_store, sess, &conf);
cdc7bbd5	112	clippy_lints::register_renamed(lint_store);
f20569fa XL	113	}));
	114
	115	// FIXME: #4825; This is required, because Clippy lints that are based on MIR have to be
	116	// run on the unoptimized MIR. On the other hand this results in some false negatives. If
	117	// MIR passes can be enabled / disabled separately, we should figure out, what passes to
	118	// use for Clippy.
	119	config.opts.debugging_opts.mir_opt_level = Some(0);
	120	}
	121	}
	122
	123	fn display_help() {
	124	println!(
	125	"\
	126	Checks a package to catch common mistakes and improve your Rust code.
	127
	128	Usage:
	129	cargo clippy [options] [--] [<opts>...]
	130
	131	Common options:
	132	-h, --help Print this message
	133	--rustc Pass all args to rustc
	134	-V, --version Print version info and exit
	135
	136	Other options are the same as `cargo check`.
	137
	138	To allow or deny a lint from the command line you can use `cargo clippy --`
	139	with:
	140
	141	-W --warn OPT Set lint warnings
	142	-A --allow OPT Set lint allowed
	143	-D --deny OPT Set lint denied
	144	-F --forbid OPT Set lint forbidden
	145
	146	You can use tool lints to allow or deny lints from your code, eg.:
	147
	148	#[allow(clippy::needless_lifetimes)]
	149	"
	150	);
	151	}
	152
	153	const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust-clippy/issues/new";
	154
	155	static ICE_HOOK: SyncLazy<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send + 'static>> = SyncLazy::new(\|\| {
	156	let hook = panic::take_hook();
	157	panic::set_hook(Box::new(\|info\| report_clippy_ice(info, BUG_REPORT_URL)));
	158	hook
	159	});
	160
	161	fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
	162	// Invoke our ICE handler, which prints the actual panic message and optionally a backtrace
	163	(*ICE_HOOK)(info);
	164
	165	// Separate the output with an empty line
	166	eprintln!();
	167
	168	let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
	169	rustc_errors::ColorConfig::Auto,
	170	None,
	171	false,
	172	false,
	173	None,
	174	false,
	175	));
	176	let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
177
178	// a .span_bug or .bug call has already printed what
179	// it wants to print.
180	if !info.payload().is::<rustc_errors::ExplicitBug>() {
ee023bcb FG	181	let mut d = rustc_errors::Diagnostic::new(rustc_errors::Level::Bug, "unexpected panic");
ee023bcb FG	182	handler.emit_diagnostic(&mut d);
f20569fa XL	183	}
	184
	185	let version_info = rustc_tools_util::get_version_info!();
	186
	187	let xs: Vec<Cow<'static, str>> = vec![
	188	"the compiler unexpectedly panicked. this is a bug.".into(),
	189	format!("we would appreciate a bug report: {}", bug_report_url).into(),
	190	format!("Clippy version: {}", version_info).into(),
	191	];
	192
	193	for note in &xs {
cdc7bbd5	194	handler.note_without_error(note);
f20569fa XL	195	}
	196
	197	// If backtraces are enabled, also print the query stack
	198	let backtrace = env::var_os("RUST_BACKTRACE").map_or(false, \|x\| &x != "0");
	199
	200	let num_frames = if backtrace { None } else { Some(2) };
	201
	202	interface::try_print_query_stack(&handler, num_frames);
	203	}
	204
	205	fn toolchain_path(home: Option<String>, toolchain: Option<String>) -> Option<PathBuf> {
	206	home.and_then(\|home\| {
	207	toolchain.map(\|toolchain\| {
	208	let mut path = PathBuf::from(home);
	209	path.push("toolchains");
	210	path.push(toolchain);
	211	path
	212	})
	213	})
	214	}
	215
	216	#[allow(clippy::too_many_lines)]
	217	pub fn main() {
	218	rustc_driver::init_rustc_env_logger();
	219	SyncLazy::force(&ICE_HOOK);
	220	exit(rustc_driver::catch_with_exit_code(move \|\| {
	221	let mut orig_args: Vec<String> = env::args().collect();
	222
	223	// Get the sysroot, looking from most specific to this invocation to the least:
	224	// - command line
	225	// - runtime environment
	226	// - SYSROOT
	227	// - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN
	228	// - sysroot from rustc in the path
	229	// - compile-time environment
	230	// - SYSROOT
	231	// - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN
	232	let sys_root_arg = arg_value(&orig_args, "--sysroot", \|_\| true);
	233	let have_sys_root_arg = sys_root_arg.is_some();
	234	let sys_root = sys_root_arg
	235	.map(PathBuf::from)
	236	.or_else(\|\| std::env::var("SYSROOT").ok().map(PathBuf::from))
	237	.or_else(\|\| {
	238	let home = std::env::var("RUSTUP_HOME")
	239	.or_else(\|_\| std::env::var("MULTIRUST_HOME"))
	240	.ok();
	241	let toolchain = std::env::var("RUSTUP_TOOLCHAIN")
	242	.or_else(\|_\| std::env::var("MULTIRUST_TOOLCHAIN"))
	243	.ok();
	244	toolchain_path(home, toolchain)
	245	})
	246	.or_else(\|\| {
	247	Command::new("rustc")
	248	.arg("--print")
	249	.arg("sysroot")
	250	.output()
	251	.ok()
	252	.and_then(\|out\| String::from_utf8(out.stdout).ok())
	253	.map(\|s\| PathBuf::from(s.trim()))
	254	})
	255	.or_else(\|\| option_env!("SYSROOT").map(PathBuf::from))
	256	.or_else(\|\| {
	257	let home = option_env!("RUSTUP_HOME")
	258	.or(option_env!("MULTIRUST_HOME"))
259	.map(ToString::to_string);
260	let toolchain = option_env!("RUSTUP_TOOLCHAIN")
261	.or(option_env!("MULTIRUST_TOOLCHAIN"))
262	.map(ToString::to_string);
263	toolchain_path(home, toolchain)
264	})
265	.map(\|pb\| pb.to_string_lossy().to_string())
266	.expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
267
268	// make "clippy-driver --rustc" work like a subcommand that passes further args to "rustc"
269	// for example `clippy-driver --rustc --version` will print the rustc version that clippy-driver
270	// uses
271	if let Some(pos) = orig_args.iter().position(\|arg\| arg == "--rustc") {
272	orig_args.remove(pos);
273	orig_args[0] = "rustc".to_string();
274
275	// if we call "rustc", we need to pass --sysroot here as well
276	let mut args: Vec<String> = orig_args.clone();
277	if !have_sys_root_arg {
278	args.extend(vec!["--sysroot".into(), sys_root]);
279	};
280
281	return rustc_driver::RunCompiler::new(&args, &mut DefaultCallbacks).run();
282	}
283
284	if orig_args.iter().any(\|a\| a == "--version" \|\| a == "-V") {
285	let version_info = rustc_tools_util::get_version_info!();
286	println!("{}", version_info);
287	exit(0);
288	}
289
290	// Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
291	// We're invoking the compiler programmatically, so we ignore this/
292	let wrapper_mode = orig_args.get(1).map(Path::new).and_then(Path::file_stem) == Some("rustc".as_ref());
293
294	if wrapper_mode {
295	// we still want to be able to invoke it normally though
296	orig_args.remove(1);
297	}
298
299	if !wrapper_mode && (orig_args.iter().any(\|a\| a == "--help" \|\| a == "-h") \|\| orig_args.len() == 1) {
300	display_help();
301	exit(0);
302	}
303
304	// this conditional check for the --sysroot flag is there so users can call
305	// `clippy_driver` directly
306	// without having to pass --sysroot or anything
307	let mut args: Vec<String> = orig_args.clone();
308	if !have_sys_root_arg {
309	args.extend(vec!["--sysroot".into(), sys_root]);
310	};
311
312	let mut no_deps = false;
313	let clippy_args_var = env::var("CLIPPY_ARGS").ok();
314	let clippy_args = clippy_args_var
315	.as_deref()
316	.unwrap_or_default()
317	.split("__CLIPPY_HACKERY__")
318	.filter_map(\|s\| match s {
319	"" => None,
320	"--no-deps" => {
321	no_deps = true;
322	None
323	},
324	_ => Some(s.to_string()),
325	})
326	.chain(vec!["--cfg".into(), r#"feature="cargo-clippy""#.into()])
327	.collect::<Vec<String>>();
328
329	// We enable Clippy if one of the following conditions is met
330	// - IF Clippy is run on its test suite OR
331	// - IF Clippy is run on the main crate, not on deps (`!cap_lints_allow`) THEN
332	// - IF `--no-deps` is not set (`!no_deps`) OR
333	// - IF `--no-deps` is set and Clippy is run on the specified primary package
f20569fa XL	334	let cap_lints_allow = arg_value(&orig_args, "--cap-lints", \|val\| val == "allow").is_some();
	335	let in_primary_package = env::var("CARGO_PRIMARY_PACKAGE").is_ok();
	336
5099ac24	337	let clippy_enabled = !cap_lints_allow && (!no_deps \|\| in_primary_package);
f20569fa XL	338	if clippy_enabled {
	339	args.extend(clippy_args);
	340	}
	341
	342	if clippy_enabled {
	343	rustc_driver::RunCompiler::new(&args, &mut ClippyCallbacks { clippy_args_var }).run()
	344	} else {
	345	rustc_driver::RunCompiler::new(&args, &mut RustcCallbacks { clippy_args_var }).run()
	346	}
	347	}))
	348	}